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Route of Administration How a peptide is delivered dramatically affects how long it stays in the body: Subcutaneous injection : slower absorption, longer duration Intramuscular injection : faster peak concentration, moderate duration Oral and intranasal peptides : often rapidly broken down, requiring protective technologies or higher doses For example, oral BPC-157 may work primarily through gut-localized pathways, while injectable versions may provide broader systemic benefits

A small subcutaneous injection, usually taken before bedtime to match natural GH release cycles

One of the causes is PA, an autoimmune disease characterized by chronic atrophic gastritis and defective absorption of cobalamin from the terminal ileum due to interference by the anti-intrinsic factor (anti-IF) antibodies

Esmati et al

Fedeli, U.G

doi: 10.1136/jitc-2022-006602 340 ZhangLZhaoJHuXWangCJiaYZhuCet al